In the Places to Sail section on this site there is some past discussion on the Maryland area. Try doing a search.
I live in Maryland as well and on the Annapolis side of the bay your options are very limited. There are lots of Hobie's around but most are launching from private property or some community owned property only available to residents. For mast up storage the only publicly available options I know of are yacht clubs or marinas.
there is a rental place in Gunpowder State Park
https://www.easternwatersports.com/ but I don't think they offer seasonal storage.
Baltimore Community Sailing Center is another option but again I don't believe they offer seasonal storage either.
Your best options that I know of where there are Hobies with mast up storage are Podickory Point yacht club or West River Sailing Club.
There might be something else up Harve de Grace way but I don't know.
I am a member at Severn Sailing Association and either sail there or from private property.
For day launching Sandy Pt. State Park seems the best option but there is no overnight storage there.